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	唯一外鍵關聯
    一.單向一對一關聯
    1.數據模型如下圖所示：


    2.數據表sql
    DROP?TABLE?T_User;
    DROP?TABLE?T_Group;

    CREATE?TABLE?T_Group?(
    ???????id?    INT?NOT?NULL?AUTO_INCREMENT
    ?????,?name?    VARCHAR(50)
    ?????,?    PRIMARY?KEY?(id)
    );

    CREATE?TABLE?T_User?(
    ???????id?    INT?NOT?NULL?AUTO_INCREMENT
    ?????,?name?    VARCHAR(50)
    ?????,?age?    INT
    ?????,?group_id?    INT?NOT?NULL
    ?????,?    PRIMARY?KEY?(id)
    ?????,?    INDEX?(group_id)
    ?????,?    CONSTRAINT?FK_T_User_1?FOREIGN?KEY?(group_id)
    ??????????????????    REFERENCES?T_Group?(id)
    );


    3.POJO類
    TUser.java
    package?cn.blogjava.start;

    public?class?TUser??implements?java.io.Serializable?{
    ????    //?Fields????
    ?????private?Integer?id;
    ?????    private?Integer?age;
    ?????    private?String?name;
    ?????    private?TGroup?group;


    ????    //?Constructors

    ????    public?Integer?getAge()?{
    ????????    return?age;
    ????}

    ????    public?void?setAge(Integer?age)?{
    ????????    this.age?=?age;
    ????}


    ????    public?TGroup?getGroup()?{
    ????????    return?group;
    ????}

    ????    public?void?setGroup(TGroup?group)?{
    ????????    this.group?=?group;
    ????}

    ????    /**?default?constructor?*/
    ????    public?TUser()?{
    ????}
    ????
    ????    /**?constructor?with?id?*/
    ????    public?TUser(Integer?id)?{
    ????????    this.id?=?id;
    ????}

    ????    //?Property?accessors

    ????    public?Integer?getId()?{
    ????????    return?this.id;
    ????}
    ????
    ????    public?void?setId(Integer?id)?{
    ????????    this.id?=?id;
    ????}

    ????    public?String?getName()?{
    ????????    return?this.name;
    ????}
    ????
    ????    public?void?setName(String?name)?{
    ????????    this.name?=?name;
    ????}
    }

    TGroup.java
    package?cn.blogjava.start;

    import?java.io.Serializable;

    public?class?TGroup?implements?Serializable?{
    ????
    ????    private?Integer?id;
    ????    private?String?name;
    ????
    ????    public?Integer?getId()?{
    ????????    return?id;
    ????}
    ????    public?void?setId(Integer?id)?{
    ????????    this.id?=?id;
    ????}
    ????    public?String?getName()?{
    ????????    return?name;
    ????}
    ????    public?void?setName(String?name)?{
    ????????    this.name?=?name;
    ????}
    ????
    }

    3.配置文件
    hibernate.cfg.xml
    <?xml?version="1.0"?encoding="UTF-8"?>
    <!DOCTYPE?hibernate-configuration?PUBLIC
    ????????"-//Hibernate/Hibernate?Configuration?DTD?3.0//EN"
    ????????"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"    >
    <hibernate-configuration>
    ????    <session-factory>
    ????????    <property?name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    ????????    <property?name="hibernate.connection.password">1234</property>
    ????????    <property?name="hibernate.connection.url">jdbc:mysql://localhost:3306/sample</property>
    ????????    <property?name="hibernate.connection.username">root</property>
    ????????    <property?name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    ????????    <mapping?resource="cn/blogjava/start/TUser.hbm.xml"?/>
    ????????    <mapping?resource="cn/blogjava/start/TGroup.hbm.xml"?/>????????
    ????    </session-factory>
    </hibernate-configuration>

    TGroup.hbm.xml
    <?xml?version="1.0"?>
    <!DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"    >
    <hibernate-mapping>
    ????    <class?name="cn.blogjava.start.TGroup"?table="T_Group"?catalog="sample">
    ????????    <id?name="id"?type="integer">
    ????????????    <column?name="id"?/>
    ????????????    <generator?class="native"?/>
    ????????    </id>
    ????????    <property?name="name"?type="string"?column="name"?/>
    ????    </class>
    </hibernate-mapping>

    TUser.hbm.xml
    <?xml?version="1.0"?>
    <!DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"    >
    <hibernate-mapping>
    ????    <class?name="cn.blogjava.start.TUser"?table="T_User"?catalog="sample">
    ????????    <id?name="id"?type="integer">
    ????????????    <column?name="id"?/>
    ????????????    <generator?class="native"?/>
    ????????    </id>
    ????????    <property?name="name"?type="string">
    ????????????    <column?name="name"?length="100"?not-null="true"?/>
    ????????    </property>
    ????????    <property?name="age"?type="java.lang.Integer"?column="age"?/>
    ????????    <many-to-one?name="group"?
    ????????????????????class    ="cn.blogjava.start.TGroup"?
    ????????????????????column    ="GROUP_ID"
    ??????????????????? cascade="all"
    ????????????????????unique    ="true"?
    ?????????    />
    ????    </class>
    </hibernate-mapping>

    4.測試代碼
    package?cn.blogjava.start;

    import?java.util.List;

    import?junit.framework.Assert;
    import?junit.framework.TestCase;

    import?org.hibernate.HibernateException;
    import?org.hibernate.Session;
    import?org.hibernate.SessionFactory;
    import?org.hibernate.Transaction;
    import?org.hibernate.cfg.Configuration;


    public?class?HibernateTest?extends?TestCase?{
    ????
    ????Session?session?=?null;

    ????protected?void?setUp()?{
    ????????try?{
    ????????????Configuration?config?=?new?Configuration().configure();
    ????????????SessionFactory?sessionFactory?=?config.buildSessionFactory();
    ????????????session?=?sessionFactory.openSession();
    ????????????
    ????????}?catch?(HibernateException?e)?{
    ????????????e.printStackTrace();
    ????????}????????
    ????}

    ????protected?void?tearDown()?{
    ????????try?{
    ????????????session.close();????????
    ????????}?catch?(HibernateException?e)?{
    ????????????e.printStackTrace();
    ????????}????????
    ????}????
    ????
    ????/**
    ?????*?對象持久化測試(Insert方法)
    ?????*/????????
    ????public?void?testInsert()?{
    ????????Transaction?tran?=?null;
    ????????try?{
    ????????
    ????????????TUser?user?=?new?TUser();
    ????????????user.setName("byf");
    ????????????user.setAge(new?Integer(26));
    ????????????
    ????????????TGroup?group?=?new?TGroup();
    ????????????group.setName("Admin");
    ????????????
    ?????????????? // 如果在配置文件中沒有cascade="all",就要先插入group信息
    ???????????//?tran?=?session.beginTransaction();????????????
    ???????????//?session.save(group);
    ???????????//?session.flush();
    ???????????//?tran.commit();
    ????????????????????????
    ????????????tran?=?session.beginTransaction();????????????????????
    ????????????//設置關聯
    ????????????user.setGroup(group);

    ?????????????? //插入user信息
    ????????????session.save(user);
    ????????????session.flush();
    ????????????tran.commit();
    ????????????Assert.assertEquals(user.getId().intValue()>0?,true);
    ????????}?catch?(HibernateException?e)?{
    ????????????e.printStackTrace();
    ????????????Assert.fail(e.getMessage());
    ????????????if(tran?!=?null)?{
    ????????????????try?{
    ????????????????????tran.rollback();
    ????????????????}?catch?(Exception?e1)?{
    ????????????????????e1.printStackTrace();
    ????????????????}
    ????????????}
    ????????}
    ????}
    ????
    ????/**
    ?????*?對象讀取測試(Select方法)
    ?????*/????????????
    ????public?void?testSelect(){
    ????????String?hql?=?"?from?TUser?where?name='byf'";
    ????????try?{
    ????????????List?userList?=?session.createQuery(hql).list();
    ????????????TUser?user?=?(TUser)userList.get(0);
    ????????????System.out.println("user?name?is?"?+?user.getName());
    ????????????System.out.println("user?group?is?"?+?user.getGroup().getName());
    ????????????Assert.assertEquals(user.getName(),?"byf");
    ????????}?catch?(Exception?e)?{
    ????????????e.printStackTrace();
    ????????????Assert.fail(e.getMessage());
    ????????}
    ????}
    }

    二.雙向一對一關聯
    需要對TGroup.java和TGroup.hbm.xml文件作修改

    1.在TGroup.java中增加一個TUser類和相應的getter、setter方法
    TGroup.java
    package?cn.blogjava.start;

    import?java.io.Serializable;

    public?class?TGroup?implements?Serializable?{
    ????
    ????private?Integer?id;
    ????private?String?name;
    ????private?TUser?user;
    ????
    ????public?TUser?getUser()?{
    ????????return?user;
    ????}
    ????public?void?setUser(TUser?user)?{
    ????????this.user?=?user;
    ????}
    ????public?Integer?getId()?{
    ????????return?id;
    ????}
    ????public?void?setId(Integer?id)?{
    ????????this.id?=?id;
    ????}
    ????public?String?getName()?{
    ????????return?name;
    ????}
    ????public?void?setName(String?name)?{
    ????????this.name?=?name;
    ????}
    ????
    }

    2.在TGroup.hbm.xml中增加one-to-one配置
    <?xml?version="1.0"?>
    <!DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"    >
    <hibernate-mapping>
    ????    <class?name="cn.blogjava.start.TGroup"?table="T_Group"?catalog="sample">
    ????????    <id?name="id"?type="integer">
    ????????????    <column?name="id"?/>
    ????????????    <generator?class="native"?/>
    ????????    </id>
    ????????    <property?name="name"?type="string"?column="name"?/>
    ????????    <one-to-one?
    ?????????????????????    name="user"
    ?????????????????????class    ="cn.blogjava.start.TUser"
    ?????????????????????property-ref    ="group"
    ?????????????????????    />
    ????    </class>
    </hibernate-mapping>

    這樣就實現了雙向關聯。可以實現雙向查詢
    package?cn.blogjava.start;

    import?java.util.List;

    import?junit.framework.Assert;
    import?junit.framework.TestCase;

    import?org.hibernate.HibernateException;
    import?org.hibernate.Session;
    import?org.hibernate.SessionFactory;
    import?org.hibernate.Transaction;
    import?org.hibernate.cfg.Configuration;


    public?class?HibernateTest?extends?TestCase?{
    ????
    ????Session?session?    =?null;

    ????    protected?void?setUp()?{
    ????????    try?{
    ????????????Configuration?config?    =?new?Configuration().configure();
    ????????????SessionFactory?sessionFactory?    =?config.buildSessionFactory();
    ????????????session?    =?sessionFactory.openSession();
    ????????????
    ????????}?    catch?(HibernateException?e)?{
    ????????????e.printStackTrace();
    ????????}????????
    ????}

    ????    protected?void?tearDown()?{
    ????????    try?{
    ????????????session.close();????????
    ????????}?    catch?(HibernateException?e)?{
    ????????????e.printStackTrace();
    ????????}????????
    ????}????
    ????
    ????    /**
    ?????*?對象持久化測試(Insert方法)
    ?????    */????????
    ????    public?void?testInsert()?{
    ????????Transaction?tran?    =?null;
    ????????    try?{
    ????????
    ????????????TUser?user?    =?new?TUser();
    ????????????user.setName(    "byf");
    ????????????user.setAge(    new?Integer(26));
    ????????????
    ????????????TGroup?group?    =?new?TGroup();
    ????????????group.setName(    "Admin");
    ????????????    ??????????????????????
    ????????????tran?    =?session.beginTransaction();????????????????????
    ????????????    //設置關聯
    ????????????user.setGroup(group);

    ????????????session.save(user);
    ????????????session.flush();
    ????????????tran.commit();
    ????????????Assert.assertEquals(user.getId().intValue()    >0?,true);
    ????????}?    catch?(HibernateException?e)?{
    ????????????e.printStackTrace();
    ????????????Assert.fail(e.getMessage());
    ????????????    if(tran?!=?null)?{
    ????????????????    try?{
    ????????????????????tran.rollback();
    ????????????????}?    catch?(Exception?e1)?{
    ????????????????????e1.printStackTrace();
    ????????????????}
    ????????????}
    ????????}
    ????}
    ????
    ????    /**
    ?????*?對象讀取測試(Select方法)
    ?????    */????????????
    ????    public?void    ?testSelect(){
    ????????String?hql?    =?"?from?TUser?where?name='byf'"    ;
    ????????String?hql2?    =?"?from?TGroup?where?name='admin'"    ;
    ????????    try    ?{
    ????????????List?userList?    =    ?session.createQuery(hql).list();
    ????????????TUser?user?    =?(TUser)userList.get(0    );
    ????????????System.out.println(    "user?name?is?"?+    ?user.getName());
    ????????????System.out.println(    "user?group?is?"?+    ?user.getGroup().getName());
    ????????????Assert.assertEquals(user.getName(),?    "byf"    );
    ????????????
    ????????????List?groupList?    =    ?session.createQuery(hql2).list();
    ????????????TGroup?group?    =?(TGroup)groupList.get(0    );
    ????????????System.out.println(    "group?name?is?"?+    ?group.getName());
    ????????????System.out.println(    "group?user?is?"?+    ?group.getUser().getName());
    ????????????Assert.assertEquals(group.getUser().getName(),?    "byf"    );????????????
    ????????}?    catch    ?(Exception?e)?{
    ????????????e.printStackTrace();
    ????????????Assert.fail(e.getMessage());
    ????????}
    ????}
    }
    
	
    posted on 2006-07-05 15:11 knowhow 閱讀(445) 評論(0)  編輯  收藏  所屬分類: ORM：Hibernate及其他 
    

    







    
	    
    




    








    

				

    





    







    
        
	



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